A:儿子与正常女子结婚,后代患病率为1/4
B:儿子与正常女子结婚,后代患者一定是女性
C:女儿与正常男子结婚,其后代患病率为1/2
D:女儿与正常男子结婚,后代患者一定是男性
下列关于电磁波的说法中,正确的是( )
—Congratulations. He did well playing football when he was very young. I hope he'll be the best player in our school.